Concluding the two-part series on the circulatory and respiratory systems, I discuss the biochemical mechanisms by which red blood cells and hemoglobin molecules deliver oxygen to the tissues and carbon dioxide to the lungs, and the mechanisms which regulate these processes. I then consider the respiratory system, giving an overview of the structure and function of the lungs, the process of breathing, control of breathing, and adaptations to high altitudes. Recommended pre-listening is Episode 122: Respiratory and Circulatory Systems Part 2.

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